VI su Wang quan die lieu gilita cac tin hieu tir cac nut dim gen nhau, dating to
1 — P*(r mo d
3.5.2 Leach C: thanh lip cym trim co' so.
Trong row tuft LEACH da di:cc m8 ti chi tiet. Trong khi co nherng thuan lqi de sir dung Leach da hinh thinh thuat toin phin ph6i ctun, nai ma mot nut to quyet djnh giii quyet ket qui tong tat ca the nut dang dirge dat vio cum, dieu nay cung cap the giao thirc !thong cli dim bio ve se luqng cac not cluster-head .Ke tir cum bran img, viec thu duqc mot cum kem thiet lap tong theri gian met Wing se khong anh Wang den rat nhieu hieu suit ding the ctia Leach. Tuy nhien, trung tam !dem soit bang each sir dung met thu$t toin de too thhnh cac cum cli thinh qui yet han bing each giii tin cac nut cluster-head ten toin mang. Day 11 co so cho LEACH-C (LEACH-Centralized), mot giao thirc ma sir dung met thuat toin cum tap trung vi On djnh cung mot giao thirc nhu LEACH (cac nut giri du lieu cita hq vio cac cluster-head, vi cac cluster-head gip hqp der lieu vi glii cac tin hieu tong hop cho cac tram co sli).
Rai fine Thing I.nng Al 77M -Rhi Tan Ting
All Nodes Base Station
• Small packets • Large energy
Clusters Famed
•Only nodes with E1 > ue eligible
Hinh 3.13. Giai dogn cal dot caa Leach-C
Trong qua trinh thiet lap cac giai dotal LEACH-C, mOi nut gin thong tin ve vj tri hien tai cim no va !tang km cho tram co s6 . Cac tram co se chay mOt thuftt town tOi tru h6a de Mk djnh cac cum. am win thanh lap 136i cac tram co se not chung duqc tot hcrn so v6i nhitng hinh thinh bang each sir dung cac thuat toil' phan phial. Tuy nhien, LEACH-C din Wu min nut truyen tai thong tin ve vj trf dm no den tram co so tai diu cim men ;tong. Thong tin nay co the duqc lay bang thch sir dung *It he thiing djnh vj than au (GPS) nhan duqc kich hoot vac lfic bit dau mai Wong, de lay vi tri hien tji cim cac nut.
Sau khi to6i uu hea cluster-head cum co lien quan duqc tim they, eke tram co s6
truyen th8ng tin nay lai cho tit ca cac nut trong mang. Dieu nay duqc thqc hien pith song cita mOt tin nhin co chira ID cac cluster-head cho miii nut. Neu ID tha cluster- head phii hop v6i ID ciut mOt nut tren cluster-head d6, nut de dam nhiem vai tr6 cluster-head; each Ichic nut xitc dish khe TDMA cho truyen da lieu va di ngil cho den then gian de truyen dtt lieu den cac cluster-head thi thirc day. Su on djnh trong thin, giai (loon ctia Leach-C la giong nhau cho cac Leach.